Name: current and magnetic field around a wire
Uploaded: 2023-04-30T12:40:55.000Z
Duration: 1 min 25 s
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K12 Standards

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North Carolina K-12 Science Standard Course of Study

9-12

Physical Science

motion-and-stability-forces-and-interactions

Motion and Stability- Forces and Interactions

PS.PSc.6.4

magnetic-force-on-a-current-carrying-conductor

Magnetic Force On A Current-Carrying Conductor

Considere una brújula colocada cerca de un conductor portador de corriente. La aguja experimenta una fuerza y se alinea tangencialmente a un círculo alrededor del conductor. Por lo tanto, se forman bucles concéntricos de campos magnéticos alrededor del conductor.
La dirección del campo magnético generado por el conductor se puede determinar mediante la regla de la mano derecha: el pulgar apunta en la dirección de la corriente y los dedos envueltos proporcionan la dirección.
Si el campo magnético se mueve hacia afuera del plano, se representa con un punto; si se mueve hacia el plano, se representa con una cruz.
Considere una sección infinitesimal del conductor portador de corriente en un campo magnético uniforme. Si n es la densidad numérica de las cargas libres, se puede determinar el número de portadores de carga en la sección.
Recordando la ecuación de la velocidad de deriva, se puede determinar la fuerza magnética en una sola carga y la fuerza magnética total en la sección.
Suponiendo que la longitud de la sección infinitesimal está en la misma dirección que la velocidad de deriva, se puede determinar la fuerza sobre el conductor portador de corriente.

<ol>
	<li>OpenStax. (2019). Física Universitaria Vol. 2. [Versión web], págs. 396 - 398. Obtenido de <a href="https://openstax.org/books/university-physics-volume-2@8ede2ba/pages/11-4-magnetic-force-on-a-current-carrying-conductor">https://openstax.org/books/university-physics-volume-2@8ede2ba/pages/11-4-magnetic-force-on-a-current-carrying-conductor</a></li>
</ol>

fuerza magnética en un conductor portador de corriente

Las cargas en movimiento experimentan una fuerza en un campo magnético. Dado que los campos magnéticos producidos por cargas en movimiento son proporcionales a la corriente, un conductor que lleva corriente crea un campo magnético a su alrededor. Considera una brújula colocada cerca de un alambre portador de corriente. El alambre experimenta una fuerza que alinea la aguja de la brújula de forma tangencial alrededor del alambre. Por lo tanto, el alambre portador de corriente produce bucles circulares concéntricos de campo magnético. El campo magnético generado por un alambre se puede determinar utilizando la regla de la mano derecha, que establece que si el pulgar apunta en la dirección de la corriente, entonces la dirección en la cual los dedos se curvan alrededor del alambre proporciona la dirección del campo magnético producido. Considera un plano rectangular en la dirección XY. Si el campo magnético se mueve fuera del plano, esas líneas de campo magnético se representan con un símbolo de punto. Si el campo magnético se mueve dentro del plano, esas líneas de campo magnético se representan con un símbolo de cruz. Considera un alambre conductor recto con corriente fluyendo desde abajo hacia arriba que tiene una longitud l y un área transversal A. El alambre conductor se coloca en un campo magnético uniforme que es perpendicular al plano y dirigido hacia el plano. La velocidad de deriva actúa hacia arriba y es perpendicular al campo magnético. La fuerza promedio en cada carga está dirigida hacia la izquierda y se expresa de la siguiente manera: <img alt="Equation1" src="/files/ftp_upload/13768/13768_Equation_1.svg" style="text-align: center; height: 22px;"> Si hay n cargas por unidad de volumen, entonces el área transversal del alambre multiplicada por el número de cargas por unidad de volumen y la longitud, da el volumen del alambre segmentado. Por lo tanto, la fuerza magnética total en el segmento tiene una magnitud de la siguiente manera: <img alt="Equation2" src="/files/ftp_upload/13768/13768_Equation_2.svg" style="text-align: center; height: 14px;"> Al recordar la ecuación de la velocidad de deriva y sustituir los términos, la fuerza total en el segmento se puede calcular de la siguiente manera: <img alt="Equation3" src="/files/ftp_upload/13768/13768_Equation_3.svg" style="text-align: center; height: 12px;">

Fuerza magnética en un conductor portador de corriente

Las cargas en movimiento experimentan una fuerza en un campo magnético. Dado que los campos magnéticos producidos por las cargas en movimiento son proporcionales a la corriente, un conductor ...

Education

Educación

JoVE Core

Physics

Física

Unit 1

Unidad 1

Magnetic Forces and Fields

Fuerzas y campos magnéticos

KEY TERMS AND CONCEPTS

TÉRMINOS Y CONCEPTOS CLAVE

current and magnetic field around a wire

A current-carrying wire creates a magnetic field around it, and moving charges feel a force in that field. Because the magnetic field produced by moving charges is proportional to current, the wire itself acts as a source of magnetic field. A compass placed near the wire shows this effect by lining up tangentially around the wire.

The magnetic field around a straight wire forms concentric circular loops. The right-hand rule helps determine the direction of those loops. If the thumb points in the direction of the current, the curled fingers show the direction of the magnetic field around the wire.

Magnetic field lines are also shown with symbols in a plane. A dot symbol means the field points out of the plane, while a cross symbol means the field points into the plane. For a straight conducting wire with current flowing upward, the wire can be placed in a uniform magnetic field directed into the plane.

In that setup, the drift velocity points upward and stays perpendicular to the magnetic field. The average force on each charge points to the left. If the wire segment has length l and cross-sectional area A, then the volume of the segment is found from A times the length, and the total magnetic force on the segment can be written from that charge count. Using the drift velocity equation lets the force be rewritten in a final form.

Current and Magnetic Field Around a Wire

magnetism

Magnetic Poles and Everyday Uses

Magnetism appears in many everyday objects, from toys and hangers to elevators, doorbells, and computer devices. Magnets have two poles, called north and south. Like poles repel each other, while unlike poles attract. Both poles can also attract unmagnetized iron. A single magnetic pole cannot be isolated, because every part of a magnet contains both a north pole and a south pole. A compass needle is a simple example of a magnet. It is a thin bar magnet suspended at its center, so it can turn...

magnetic fields

Magnetic Force on Moving Charges

Magnetic force on moving charges depends on motion, charge, and field direction. A moving charge or a current creates a magnetic field in the space around it, along with its electric field. That magnetic field can then push on other moving charges or currents in the field. A magnetic field is a vector field, so it has direction as well as strength. At any point, the field direction is the direction a compass needle’s north pole points. The field strength is defined from the force a charged...

magnetic field lines

Reading Magnetic Field Lines

Magnetic field lines show the direction and strength of a magnetic field. They make it easier to picture how a magnet acts in space. Each line forms a closed loop around the magnet. For a bar magnet, the field lines leave the north pole and curve around to the south pole. They then continue through the magnet back to the north pole. This loop has no beginning or end. Magnetic field lines follow clear rules. The magnetic field points tangent to a field line at any point. A small compass points...

magnetic flux

Magnetic Flux Through Surfaces

Magnetic flux through a surface describes how much magnetic field passes across that surface. It is measured in weber (Wb), the SI unit for magnetic flux. Magnetic flux is a scalar quantity, not a vector. Three factors shape magnetic flux. They are the magnetic field strength B, the area the field crosses, and the orientation of the field relative to the surface. For a small area element dA, the flux depends on the part of the magnetic field that is normal, or perpendicular, to that element at...

motion of a charged particle in a magnetic field

motion-of-a-charged-particle-in-a-magnetic-field

Charged Particle Paths in Magnetic Fields

A charged particle in a magnetic field follows a path that depends on the direction of its velocity. When the field is uniform and the particle moves perpendicular to it, the magnetic field is the main factor that controls the motion, especially in a vacuum. The magnetic force is always perpendicular to the direction of motion, so the particle curves into a circle. Because the force stays perpendicular to velocity, it does no work on the particle. The kinetic energy and speed stay constant...

magnetic force

Magnetic Fields and Moving Charges

Magnetic fields and moving charges create magnetic force. A moving electric charge, or a current made of many moving charges, produces a magnetic field. When another current or moving charge enters that field, it feels a magnetic force in response. At the atomic level, magnetic forces come from interactions between moving electrons in the atoms of two bodies. The strength of magnetic force depends on several factors. It increases with the size of the charge and with the strength of the...

magnetic force on a current-carrying conductor

A current-carrying wire creates a magnetic field around it, and moving charges feel a force in that field. Because the magnetic field produced by moving charges is proportional to current, the wire itself acts as a source of magnetic field. A compass placed near the wire shows this effect by lining up tangentially around the wire. The magnetic field around a straight wire forms concentric circular loops. The right-hand rule helps determine the direction of those loops. If the thumb points in...

magnetic force on current-carrying wires: example

magnetic-force-on-current-carrying-wires-example

Balancing Weight with Magnetic Force

Magnetic force can balance the weight of a current-carrying wire when the wire sits in a magnetic field. Moving charges in the wire feel a force, so the wire itself can be pushed upward or downward. This example uses a flexible wire that is 40 cm long and has a mass of 10 g. It is held in a horizontal position inside a constant 0.40 T magnetic field. The goal is to find the current needed to remove the tension in the supporting leads. To do that, a free-body diagram is drawn first. The diagram...

force on a current loop in a magnetic field

force-on-a-current-loop-in-a-magnetic-field

Current Loops and Torque in Motors

Current loops in a magnetic field create the torque that drives a DC motor. A DC motor converts electrical energy into mechanical work. In a motor, wire loops sit inside a magnetic field. When current flows through the loops, the magnetic field pushes on them and makes the shaft rotate. The current is reversed when the loop lines up with the magnetic field. This keeps the torque on the loop going in the same direction. A commutator and brushes handle this reversal. The commutator switches the...

torque on a current loop in a magnetic field

torque-on-a-current-loop-in-a-magnetic-field

Current Loop Torque in Electric Motors

Current loop torque in electric motors shows how magnetic force can make a wire loop rotate. In an electric motor, loops of wire sit between magnets in a magnetic field. When current flows through the loops, the field applies torque. This rotation turns a shaft and converts electrical energy into mechanical energy. A rectangular current-carrying loop with N turns in a uniform magnetic field has zero net force. Even so, it can still experience net torque. The torque depends on the current I,...

the hall effect

Hall Voltage and Charge Carriers

Hall voltage and charge carriers are explained through Edwin H. Hall’s 1879 experiment. His setup helped identify the polarity of the main charge carriers in a conducting material. It also showed, for the first time, that the charge carriers in most metals are negative. A metal slab is placed in a constant magnetic field. The electrons move from right to left, so the magnetic force pushes them toward the top edge of the slab. This leaves excess negative charge at the top and excess positive...

thomson's e/m experiment

Electron Speed Selector in Thomson’s Tube

A velocity selector uses electric and magnetic fields to choose charged particles with one speed from a beam. Many beams from a heated cathode contain particles moving at different speeds, so this setup helps produce a uniform beam. The electric and magnetic fields are perpendicular to the particle’s motion and to each other. In this arrangement, a particle with charge q, speed v, and mass m enters from the top. The magnetic field points into the plane of the paper, and the electric field...

key terms and concepts

See how a current-carrying wire creates circular magnetic field lines, how the right-hand rule shows field direction, and how force acts on moving charges.

Current and Magnetic Field Around a Wire | JoVE K12

physics

JoVE Core Física presenta la teoría y la aplicación de conceptos físicos fundamentales, como la cinemática, dinámica, mecánica de fluidos, estática, ondas y acústica, mediante animaciones audiovisuales concisas y fáciles de entender. Además, los vídeos de científicos en acción muestran la aplicación de los conceptos relacionados en experimentos de investigación clásicos y originales, realizados en laboratorios de todo el mundo.

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Ohio’s Learning Standards and Model Curriculum

Electricity And Magnetism

Electromagnetic interactions

Tennessee Academic Standards

High School

Energy

PHYS.PS3.9

Virginia  Standards of Learning

HIgh School

PS.9

PS.9.d

PH.7

PH.7.a

PH.7.b

Minnesota Academic Standards in Science

3.1.1 9P.2.2.1.3

Alabama Course of Study Science

waves-and-their-applications-in-technologies-for-information-transfer

Waves and Their Applications in Technologies for Information Transfer

9-12.PS.2.3.b

Florida Department of Education

SC.912.P.10

SC.912.P.10.10

new-york-state-science-learning-standards

New York State Science Learning Standards

HS. Forces and Interactions

HS-PS2-5.

HS. Energy

HS-PS3-5.

Position and Displacement

The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary ...

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Instantaneous Velocity - I

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Instantaneous Velocity - II

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Average Acceleration

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Instantaneous Acceleration

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average-and-instantaneous-velocity-vectors

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Analyze and interpret data to explain the motion of an object moving with a constant velocity or that is accelerating.

PS.PSc.4.1

Electrical Current

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Drift Velocity

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Current Density

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Resistivity

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Resistance

When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known ...

Ohm's Law

Many materials exhibit a simple relationship between the values of current, voltage, and resistance, known as Ohm&#8217;s law. The current that flows ...

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and ...

Construct an explanation to compare simple series and parallel circuits in terms of Ohm's Law.

PS.PSc.6.2

Continuity Equation

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Boundary Conditions for Current Density

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Magnetic Field Lines

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Magnetic Flux

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Motion Of A Charged Particle In A Magnetic Field

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Magnetic Force

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magnetic-force-between-two-parallel-currents

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Magnetic Field of a Solenoid

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Use models to explain magnetism in terms of domains, interactions of poles, and magnetic fields.

Analyze motion in terms of speed, velocity, acceleration, and momentum.

Current and Magnetic Field Around a Wire

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